I don’t mean to offend, but all these things are perfectly possible with the basic tools. However it takes quite the amount of juggling.
A few standard restrictions we will always have are
Walls have to be 5 blocks high + for the reason a hearthling seems to be 4 blocks high. Now I don’t know about your house but we have headspace and plenty of it.
Roof tools work perfectly well on any outer wall and changing the current way of making roofs instantly would mess with much more than that tool. Instead try to put down roofs first ( use this tool as well for even higher top floors ) and simply add the rest after the main roof and walls are in place.
Don’t get your hopes up too soon because inspiration is the best thing you will be able to use right now.
I’ve seen the streamers building palaces and what not, but those things are not slightly impressive for the fact I couldn’t see inside if I liked to. This bothers me so much I simply forced myself to explore the limits of the editor and they aren’t as bad as I initially thought. Try some random stuff and maybe you will get inspiration as well. Slabs can’t be seethrough as that would mess with more floor tiles than building tiles currently
hope this clears up.